7 files declare their use of QuizQuestionTestBase in Quiz 6.x

LongAnswerTestCase.php in question_types/quiz_long_answer/tests/src/Functional/LongAnswerTestCase.php

Unit tests for the long_answer Module.

MatchingTestCase.php in question_types/quiz_matching/tests/src/Functional/MatchingTestCase.php

QuizDirectionsTestCase.php in question_types/quiz_directions/tests/src/Functional/QuizDirectionsTestCase.php

Unit tests for the quiz_directions Module.

QuizMultichoiceTestCase.php in question_types/quiz_multichoice/tests/src/Functional/QuizMultichoiceTestCase.php

QuizPageTestCase.php in question_types/quiz_page/tests/src/Functional/QuizPageTestCase.php

QuizTrueFalseTestCase.php in question_types/quiz_truefalse/tests/src/Functional/QuizTrueFalseTestCase.php

ShortAnswerTestCase.php in question_types/quiz_short_answer/tests/src/Functional/ShortAnswerTestCase.php

Unit tests for the short_answer Module.